From b27ecec76b8acfece9c28078d02cbc6bc762135c Mon Sep 17 00:00:00 2001 From: Ben Zong-You Xie Date: Mon, 29 Dec 2025 15:19:14 +0800 Subject: lib: utils/suspend: add Andes ATCSMU suspend driver Implement a system-wide suspend driver for the Andes AE350 platform. This driver supports Andes-specific deep sleep (suspend to RAM) and light sleep (suspend to standby) functionalities via the ATCSMU. The major differences between deep sleep and light sleep are: - Power Domain and Resume Path: Deep sleep powers down the core domain. Consequently, harts waking from deep sleep resume from the reset vector. Light sleep utilizes clock gating to the core domain; harts maintain state and resume execution at the instruction immediately following the WFI instruction. - Primary Hart Wakeup: In both modes, the primary hart is woken by UART or RTC alarm interrupts. In deep sleep, the primary hart is additionally responsible for re-enabling the Last Level Cache (LLC) and restoring Andes-specific CSRs. - Secondary Hart Wakeup: In light sleep, secondary harts are woken by an IPI sent from the primary hart. In deep sleep, they are woken by an ATCSMU hardware wake-up command. Furthermore, secondary harts must restore Andes-specific CSRs when returning from deep sleep. Signed-off-by: Ben Zong-You Xie Signed-off-by: Leo Yu-Chi Liang Link: https://lore.kernel.org/r/20251229071914.1451587-6-ben717@andestech.com Signed-off-by: Anup Patel --- include/sbi_utils/hsm/fdt_hsm_andes_atcsmu.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include') diff --git a/include/sbi_utils/hsm/fdt_hsm_andes_atcsmu.h b/include/sbi_utils/hsm/fdt_hsm_andes_atcsmu.h index ef851b75..5e71fab7 100644 --- a/include/sbi_utils/hsm/fdt_hsm_andes_atcsmu.h +++ b/include/sbi_utils/hsm/fdt_hsm_andes_atcsmu.h @@ -60,5 +60,6 @@ int atcsmu_set_reset_vector(u64 wakeup_addr, u32 hartid); u32 atcsmu_get_sleep_type(u32 hartid); void atcsmu_write_scratch(u32 value); u32 atcsmu_read_scratch(void); +bool atcsmu_pcs_is_sleep(u32 hartid, bool deep_sleep); #endif -- cgit v1.2.3